Sidelink transmission method and terminal

ABSTRACT

Provided in an embodiment of the present disclosure are a sidelink transmission method and a terminal. The sidelink transmission method includes receiving SCI through a PSCCH of a sidelink. The SCI includes an information field, and the information field is used to indicate physical layer information of the sidelink.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is a continuation of U.S. patent applicationSer. No. 17/069,035 filed on Oct. 13, 2020, which is a continuation ofPCT Application No. PCT/CN2019/080771 filed on Apr. 1, 2019, whichclaims a priority of the Chinese patent application No. 201810333591.2filed in China on Apr. 13, 2018, which is incorporated herein byreference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of communicationstechnology, in particular to a sidelink transmission method and aterminal.

BACKGROUND

Currently, a long terminal evolution (Long Term Evolution, LTE) systemsupports sidelink, which is used to perform direct transmission betweenterminals, rather than through a network device. However, in the currentLTE system, the sidelink transmission is performed on the basis ofbroadcasting, and a receiving terminal does not feed back anyinformation to a transmitting terminal. For example, when only one pieceof data is transmitted, the receiving terminal may probably fail toreceive the piece of data due to various reasons, so transmissionreliability of the system is relatively low. When a plurality of piecesof same data is broadcast by the transmitting data to ensure the datatransmission reliability, a resource utilization rate and the frequencyefficiency of the system may be reduced. In a word, the current sidelinktransmission performance is insufficient.

SUMMARY

An embodiment of the present disclosure is to provide a sidelinktransmission method and a terminal.

In a first aspect, the present disclosure provides in an embodiment asidelink transmission method operable by a first terminal, includingtransmitting sidelink control information (Sidelink Control Information,SCI) through a physical sidelink control channel (Physical SidelinkControl Channel, PSCCH) of a sidelink. The SCI includes an informationfield, and the information field is used to indicate physical layerinformation of the sidelink.

In a second aspect, the present disclosure provides in an embodiment asidelink transmission method operable by a second terminal, includingreceiving SCI through a PSCCH of a sidelink. The SCI includes aninformation field, and the information field is used to indicatephysical layer information of the sidelink.

In a third aspect, the present disclosure provides in an embodiment aterminal, which is a first terminal and includes a transmission moduleconfigured to transmit SCI through a PSCCH of a sidelink. The SCIincludes an information field, and the information field is used toindicate physical layer information of the sidelink.

In a fourth aspect, the present disclosure provides in an embodiment aterminal, which is a second terminal and includes a reception moduleconfigured to receive SCI through a PSCCH of a sidelink. The SCIincludes an information field, and the information field is used toindicate physical layer information of the sidelink.

In a fifth aspect, the present disclosure provides in an embodiment aterminal, which is a first terminal and includes a memory, a processor,and a computer program stored in the memory and capable of beingexecuted by the processor. The processor is configured to execute thecomputer program so as to implement the steps of the sidelinktransmission method for a side of the first terminal according to anembodiment of the present disclosure.

In a sixth aspect, the present disclosure provides in an embodiment aterminal, which is a second terminal and includes a memory, a processor,and a computer program stored in the memory and capable of beingexecuted by the processor. The processor is configured to execute thecomputer program so as to implement the steps of the sidelinktransmission method for a side of the second terminal according to anembodiment of the present disclosure.

In a seventh aspect, the present disclosure provides in an embodiment acomputer-readable storage medium storing therein a computer program. Thecomputer program is capable of being executed by a processor toimplement the steps of the sidelink transmission method for the side ofthe first terminal or the steps of the sidelink transmission method forthe side of the second terminal according to the embodiments of thepresent disclosure.

According to the embodiments of the present disclosure, the SCI may betransmitted through the PSCCH of the sidelink, the SCI may include theinformation field, and the information field may be used to indicate thephysical layer information of the sidelink. As a result, it is able toimprove the sidelink transmission performance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structure schematic view showing an applicable networksystem according to an embodiment of the present disclosure;

FIG. 2 is a flow chart of a sidelink transmission method according to anembodiment of the present disclosure;

FIG. 3 is a flow chart of another sidelink transmission method accordingto an embodiment of the present disclosure;

FIG. 4 is a structure schematic view showing a terminal according to anembodiment of the present disclosure;

FIG. 5 is a structure schematic view showing another terminal accordingto an embodiment of the present disclosure; and

FIG. 6 is a structure schematic view showing yet another terminalaccording to an embodiment of the present disclosure.

DETAILED DESCRIPTION

FIG. 1 is a structure schematic view showing an applicable networksystem according to an embodiment of the present disclosure. As shown inFIG. 1 , the network system includes a plurality of terminals. Theterminal may also be called as terminal device or user equipment (UserEquipment, UE), and it may be a terminal side device such as mobilephone, tablet personal computer, laptop computer, personal digitalassistant (Personal Digital Assistant, PDA), mobile Internet device(Mobile Internet Device, MID), wearable device, or vehicle-mounteddevice. It should be appreciated that, in the embodiments of the presentdisclosure, a specific type of the terminal will not be particularlydefined. In the embodiments of the present disclosure, the plurality ofterminals may communicate with each other through a sidelink, e.g.,transmit data or signaling. In addition, the plurality of terminals maycommunicate with each other through the sidelink in a one-to-one,one-to-many or many-to-one manner, which will not be limited thereto.Naturally, the network system may further include a network side device,and the network side device may communicate with the terminals, e.g.,transmit signaling or data. Naturally, in some scenarios, it isimpossible for some terminals to communicate with the network sidedevice, e.g., when the terminals are located beyond a coverage of thenetwork. The network side device may be a base station, e.g., a4th-generation (4th-Generation, 4G) base station, a 5th-generation(5th-Generation, 5G) base station, a future base station, or a basestation in any other communications system. The base station may also becalled as node B, evolved node B, or any other term known in the art.The base station shall not be limited to a specific technical term, aslong as a same technical effect is achieved. It should be appreciatedthat, only the 5G base station is taken as an example in the embodimentsof the present disclosure, but a specific type of the network sidedevice will not be limited thereto.

As shown in FIG. 2 , the present disclosure provides in an embodiment asidelink transmission method operable by a first terminal, whichincludes Step 201 of transmitting SCI through a PSCCH of a sidelink. TheSCI includes an information field, and the information field is used toindicate physical layer information of the sidelink.

The SCI may be SCI transmitted by an opposite terminal (a secondterminal), e.g., SCI transmitted by the first terminal to the oppositeterminal prior to or during the transmission of data via the sidelink.The physical layer information may be related information of atransmission state of a physical layer of the sidelink or channelquality. For example, the physical layer information may be feedbackinformation of the physical layer, e.g., retransmission acknowledge orchannel state information (Channel State Information, CSI), or thephysical layer information may be, e.g., information of a measurementconfiguration of the physical layer or a reference signal configuration.Because the SCI includes the information field indicating the physicallayer information of the sidelink, the first terminal and the oppositeterminal may perform the corresponding transmission in accordance withthe physical layer information during the data transmission.

It should be appreciated that, in the sidelink, the first terminal mayserve as a receiving terminal or a transmitting terminal, which will notbe particularly defined herein. This is because, in a sidelinktransmission scenario, the signaling or data transmission may beperformed in a two-way manner.

In Step 201, the SCI may indicate the physical layer information throughthe information field, so as compared with the related art where thereceiving terminal does not feed back any information to thetransmission end, in the embodiments of the present disclosure, it isable to improve the sidelink transmission performance.

In addition, through the SCI, it is able to configure channelmeasurement for the physical layer of the sidelink and transmit physicallayer feedback information, so as to establish a physical layerpoint-to-point connection between the first terminal and the oppositeterminal, and support the terminal to perform the transmission at thephysical layer of the sidelink in a unicasting manner, and feed back theretransmission acknowledgement or the CSI or the like. In addition, itis able to match beams between the terminals, so as to improve aresource utilization rate of the system and the spectrum efficiency,thereby to improve the sidelink transmission performance. For example,the first terminal and the second terminal may match beams in accordancewith the physical layer feedback information, and transmit the datausing the matched beams. Alternatively, the second terminal mayretransmit data in accordance with the physical layer feedbackinformation fed back by the first terminal, and identically, the firstterminal may perform such operations as data retransmission inaccordance with the physical layer feedback information fed back by thesecond terminal.

It should be appreciated that, the method in the embodiments of thepresent disclosure may be applied to, but not limited to, an LTEsidelink or 5G new radio (New Radio, NR) sidelink. It may be applied toany other communications system, e.g., a 6^(th)-generation(6^(th)-Generation, 6G) system or any other communications system withthe sidelink, as long as a substantially same function is capable ofbeing achieved.

In a possible embodiment of the present disclosure, the physical layerinformation may include at least one of feedback information, abeta-offset indicator, a scheduling data indicator, an acknowledgementrequest indicator, a measurement configuration, a reference signalindicator, a feedback object indicator and a hybrid automatic repeatrequest (Hybrid Automatic Repeat Request, HARQ) process indicator.

The feedback information may be transmission feedback information, e.g.,a transmission acknowledgement of a physical sidelink shared channel(Physical Sidelink Shared Channel, PSSCH) or a hybrid automatic repeatrequest acknowledgement (Hybrid Automatic Repeat RequestAcknowledgement, HARQ-ACK), or the feedback information may bemeasurement feedback information, e.g., CSI.

In a possible embodiment of the present disclosure, the feedbackinformation may include at least one of retransmission acknowledgementinformation and a CSI measurement result.

Through the retransmission acknowledgement information, it is able toincrease a success rate of the sidelink data transmission, because thetransmitting terminal may retransmit the data in accordance with thefeedback information after the data fed back has been receivedunsuccessfully. In addition, it is able to prevent the blindretransmission. Through the CSI measurement result, it is able toperform the transmission adaptively, e.g., perform beam matching, so asto improve the transmission performance.

Naturally, the feedback information may also be information capable ofbeing fed back between the other terminals, which will not beparticularly defined herein. Through the feedback information, it isable to increase the success rate of the data transmission, and performthe transmission adaptively in accordance with the feedback information,e.g., perform the beam matching. In a word, through the feedbackinformation, it is able to improve the sidelink transmissionperformance.

The beta-offset indicator may be used to indicate beta-offsetconfiguration actually used for feedback bits and resource mapping ofthe PSSCH when the feedback bits are transmitted by reusing the PSSCH.The beta-offset configuration may indicate the quantity of resourceelements (Resource Elements, REs) allocated for the feedback bits.Through the beta-offset indicator, it is able to improve the interactionperformance between the terminals, thereby to improve the sidelinktransmission performance.

The scheduling data indicator may be used to indicate that only thefeedback bits, rather than high-layer data or a transport block(Transport Block, TB), is carried in the PSSCH. Through the schedulingdata indicator, it is able to improve the interaction performancebetween the terminals, thereby to improve the sidelink transmissionperformance.

The acknowledgement request indicator may be used to indicate whether totransmit acknowledgement feedback by the receiving terminal with respectto the PSSCH scheduled by the SCI. Through the acknowledgement requestindicator, it is able to indicate whether to perform feedback by thereceiving terminal, so as to prevent the receiving terminal from notperforming any feedback or performing unnecessary feedback, thereby toimprove the sidelink transmission performance. Naturally, in theembodiments of the present disclosure, whether to perform the feedbackmay also be pre-configured.

The measurement configuration may be used to indicate whether to enablesidelink measurement and indicate an enabled measurement configuration.Through the measurement configuration, it is able to improve thesidelink measurement performance.

The reference signal indicator may be used to indicate whether to enablesidelink reference signal measurement and indicate a reference signalconfiguration of a sidelink measurement reference signal. When thesidelink reference signal measurement is enabled, a resource mappingposition of the PSSCH scheduled by the SCI may not overlap with aresource position of the reference signal. Through the reference signalindicator, it is able to improve the sidelink measurement performance.

The feedback object indicator may be used to indicate identificationinformation of the receiving terminal, e.g., identity (ID), group ID,fixed ID, temporary ID or truncated ID. Through the feedback object, itis able to improve the sidelink feedback information.

The HARQ process indicator may be used to indicate at least one of anHARQ process of the SCI-scheduling data and an HARQ process of theHARQ-ACK feedback, so as to prevent the occurrence of an error, therebyto improve the sidelink transmission performance, e.g., prevent theprocesses for the two terminals from being different from each other.

It should be appreciated that, the above physical layer information maybe encoded jointly, or some pieces of information may be indicatedthrough different independent fields, which will not be limited thereto.In addition, the information in the physical layer information may beindicated through, e.g., pre-configuration, Radio Resource Control (RRC)signaling configuration by a network side, or through sidelinkbroadcasting configuration.

In a possible embodiment of the present disclosure, the informationfield may include at least one of a feedback indication field, abeta-offset indication field, a scheduling data indication field, anacknowledgement request indication field, a measurement configurationindication field, a reference signal indication field, a feedback objectindication field and an HARQ process number field.

The feedback indication field may include the feedback information, thebeta-offset indication field may include the beta-offset indicator, thescheduling data indication field may include the scheduling dataindicator, the acknowledgement request indication field may include theacknowledgement request indicator, the measurement configurationindication field may include the measurement configuration indicator,the reference signal indication field may include the reference signalindicator, the feedback object indication field may include the feedbackobject indicator, and the HARQ process number field may include the HARQprocess indicator.

During the implementation, the SCI may include at least one of the abovefields, so it is able to further improve the sidelink transmissionperformance.

In a possible embodiment of the present disclosure, the feedbackindication field may include a predefined value or a predefined codepoint, and the predefined value or the predefined code point mayrepresent that the feedback information is not carried in the SCI or thePSSCH scheduled by the SCI; or the feedback indication field may includefeedback bits representing the feedback information; or the feedbackindication field may include a value in a predefined set, and the valuemay represent that the feedback information is carried in or reused bythe PSSCH scheduled by the SCI.

The predefined value, the predefined code point and the predefined setmay be predefined in a protocol, or pre-configured by the network sidedevice, which will not be limited thereto. In addition, the quantity ofcardinalities or elements in the predefined set may be greater than orequal to 1. In the embodiments of the present disclosure, the feedbackindication field may be of a fixed length, e.g., M bits, where M is aninteger greater than or equal to 1.

During the implementation, when the feedback indication field includesthe predefined value or the predefined code point, it may be used toindicate that no feedback is to be performed. As a result, in somescenarios that no feedback needs to be performed, through the feedbackindication field, it is able to prevent the transmitting terminal fromwaiting for a feedback behavior of the receiving terminal, thereby toimprove the transmission efficiency between the transmitting terminaland the receiving terminal.

In addition, during the implementation, the feedback indication fieldmay also directly include the feedback bits, i.e., the feedback may beperformed through the SCI, so as to improve the feedback efficiency. Thefeedback bits in the feedback indication field may include feedback bitsof all types, or feedback bits of some specific types (e.g., HARQ-ACK).The feedback bits of different types may be carried in accordance withcommunication requirements, so as to improve the sidelink feedbackperformance.

In addition, during the implementation, the feedback indication fieldmay also be used to indicate the feedback information is carried in orreused by the PSSCH, so as to enable the PSSCH to carry or reuse thefeedback information.

Further, an encoding and mapping mode of the feedback information in thePSSCH may correspond to the value, and/or the quantity of the feedbackbits of the feedback information in the PSSCH may correspond to thevalue.

In other words, at least one of the encoding and mapping mode and thequantity of the feedback bits of the feedback information in the PSSCHmay correspond to the value. Different values may indicate differentencoding and mapping modes and different quantities of feedback bits. Inthis regard, it is able to determine the encoding and mapping mode ofthe feedback information and the quantity of the feedback bits of thefeedback information in accordance with the value, so as to accuratelydecode the feedback information.

Further, in the case that the quantity of the feedback bits of thefeedback information is smaller than a specific threshold, the feedbackindication field may include the feedback bits, and in the case that thequantity of the feedback bits of the feedback information is greaterthan or equal to the specific threshold, the feedback indication fieldmay include the value in the predefined set.

Through the above two implementation modes, it is able to perform thefeedback flexibly in an appropriate way, thereby to improve the sidelinkfeedback performance.

Further, the feedback information may include at least one ofretransmission acknowledgement information and a CSI measurement result.

Through the retransmission acknowledgement information, it is able toincrease a success rate of the sidelink data transmission, because thetransmitting terminal may retransmit the data in accordance with thefeedback information after the data fed back has been receivedunsuccessfully. In addition, it is able to prevent the blindretransmission. Through the CSI measurement result, it is able toperform the transmission adaptively, e.g., perform beam matching, so asto improve the transmission performance.

In a possible embodiment of the present disclosure, the beta-offsetindication field may be implemented in the following modes.

First mode: in the case that the feedback information is carried in orreused by the PSSCH scheduled by the SCI, the beta-offset indicationfield may be used to indicate a beta-offset configuration used for bitmapping of the PSSCH.

In this mode, it is able to indicate the beta-offset configuration usedfor the bit mapping of the PSSCH through the beta-offset indicationfield, so as to determine the beta-offset configuration in accordancewith the beta-offset indication field, and transmit or receive thecorresponding PSSCH, thereby to improve the transmission performance.

Second mode: the beta-offset indication field may include a predefinedvalue or a predefined code point, and the predefined value or thepredefined code point may represent that the feedback information is notcarried in the SCI or the PSSCH scheduled by the SCI.

In this mode, it is able to indicate the beta-offset indication fieldand the feedback indication field together, i.e., it is able for the twoto achieve a same function. The description about the predefined valueor the predefined code point may refer to that about the predefinedvalue or the predefined code point in the feedback indication fieldmentioned hereinabove with a same beneficial effect, and thus will notbe particularly defined herein.

Third mode: values of the beta-offset indication field may be dividedinto two sub-spaces. In the case that the value of the beta-offsetindication field belongs to a first predefined sub-space, thebeta-offset indication field may be used to indicate that the feedbackindication field includes a feedback bit and indicate the beta-offsetconfiguration used for the bit mapping of the PSSCH. In the case thatthe value of the beta-offset indication field belongs to a secondpredefined sub-space, the beta-offset indication field may be used toindicate a specific feedback mode.

Identically, in this implementation, it is able to indicate thebeta-offset indication field and the feedback indication field together,and indicate different contents through values of different sub-spaces,so as to improve the performance of the beta-offset indication field,thereby to meet different communication requirements.

In addition, the specific feedback mode may include a mode that thefeedback indication field includes the predefined value or thepredefined code point, a mode that the feedback indication fieldincludes feedback information of a specific type, or a mode that whetheronly the feedback bits, rather than the high-layer data or a TB, arecarried in the PSSCH scheduled by the SCI.

Naturally, the above three feedback modes are only for illustrativepurposes, and the present disclosure is not limited thereto. Thespecific feedback mode may be configured in accordance with differentcommunication requirements, so as to improve the SCI compatibility.

The scheduling data indication field, the acknowledgement requestindication field, the measurement configuration indication field, thereference signal indication field, the feedback object indication fieldand the HARQ process number field will be described hereinafter.

In a possible embodiment of the present disclosure, the scheduling dataindication field may be used to indicate whether only the feedback bits,rather than the high-layer data or a TB, are carried in the PSSCHscheduled by the SCI. The scheduling data indication field may be afield independent of another field in the SCI, or the scheduling dataindication field may be at least one value or code point in the otherfield. The other fields may be a PSSCH time-domain or frequency-domainresource allocation field, the feedback indication field, thebeta-offset indication field, the acknowledge request indication field,the measurement configuration indication field, the reference signalindication field, the feedback object indication field information, orthe HARQ process number field.

Through the scheduling data indication field, it is able to indicatewhether the PSSCH only carries the feedback bits, rather than thehigh-layer data or the TB, so as to improve the reciprocity between theterminals and prevent the occurrence of some errors. For example, whenthe PSSCH only carries the feedback bits, it is able to prevent thereceiving terminal to receive the PSSCH in a data reception mode. Inaddition, when the scheduling data indication field is at least onevalue or code point in the other field, it is able to reduce signalingoverhead.

In a possible embodiment of the present disclosure, the acknowledgementrequest indication field may be used to indicate whether to transmitacknowledgement feedback by the receiving terminal with respect to thePSSCH scheduled by the SCI, and the receiving terminal may be a terminalwhich receives the PSSCH.

It should be appreciated that, the receiving terminal may be the firstterminal, or another terminal. This is because, during the transmissionof PSSCH or signaling, the first terminal may serve as a transmittingterminal or a receiving terminal.

Through the acknowledge request indication field, it is able to preventthe receiving terminal from not performing any feedback or performingunnecessary feedback, so as to improve the sidelink transmissionperformance. Naturally, in the embodiments of the present disclosure,whether to perform the feedback may also be pre-configured.

In a possible embodiment of the present disclosure, the measurementconfiguration indication field may be used to indicate whether to enablesidelink channel measurement and indicate a measurement configurationfor the sidelink channel measurement.

Through the measurement configuration indication field, it is able toconfigure the sidelink channel measurement, thereby to improve thesidelink measurement performance.

In a possible embodiment of the present disclosure, the reference signalindication field may be used to indicate whether to enable sidelinkreference signal measurement, and indicate a reference signalconfiguration of the sidelink measurement reference signal. When thesidelink reference signal measurement is enabled, a resource mappingposition of the PSSCH scheduled by the SCI may not overlap with aresource position of the reference signal.

When the resource mapping position of the PSSCH scheduled by the SCIdoes not overlap with the resource position of the reference signal, itmay be understood as that the resource mapping of the PSSCH needs toavoid a time-frequency position of the reference signal, so as toimprove the measurement performance of the reference signal.

Through the reference signal indication field, it is able to improve thesidelink measurement performance.

Further, the measurement configuration indication field and thereference signal indication field may be encoded jointly, to reduce thesignaling overhead.

In a possible embodiment of the present disclosure, the feedback objectindication field may be used to indicate an ID of a receiving terminal,a group ID of the receiving terminal, a fixed ID of the receivingterminal allocated by a network, a temporary ID or a truncated ID of thereceiving terminal allocated by the network. The receiving terminal maybe a terminal that performs the feedback.

Identically, the receiving terminal may be the first terminal or theother terminal. This is because, during the transmission of the PSSCH orsignaling, the first terminal may serve as a transmitting terminal or areceiving terminal.

Through the feedback object indication field, it is able to improve thesidelink feedback performance.

In a possible embodiment of the present disclosure, the HARQ processnumber field may be used to indicate at least one of an HARQ process forthe SCI-scheduling data and an HARQ process for HARQ-ACK feedback.

Through the HARQ process number field, it is able to improve thesidelink transmission performance, and prevent the occurrence of errors,thereby to improve the sidelink transmission performance, e.g., preventthe processes for two terminals from being different from each other.

In a possible embodiment of the present disclosure, at least one fieldcomprised in the information field may be indicated throughpre-configuration, or RRC signaling configuration by the network side,or sidelink broadcasting configuration. In other words, the fields inthe SCI may be indicated through pre-configuration, or RRC signalingconfiguration by the network side, or sidelink broadcastingconfiguration by the UE, so as to improve the flexibility of the SCI,reduce the signaling overhead, and meet the requirements on variousterminals or the communication requirements.

The fields in the SCI will be illustratively described below inconjunction with examples.

First Example

As an SCI instance, the SCI may include, but not limited to, thefeedback indication field, the feedback object indication field and theHARQ process number.

The feedback indication field may have 4 bits for carrying the feedbackbits, i.e., at most 4 feedback bits (e.g., 2-bit HARQ-ACK and 2-bit CSI)may be carried.

It should be appreciated that, the above values are for illustrativepurposes, but shall not be used to limit the present disclosure.

The feedback object indication field may have 8 or 16 bits forindicating one receiving terminal or a group of receiving terminals forthe feedback bits. It may include an ID of a receiving terminal, a groupID, a fixed or temporary ID allocated by the network (e.g., a radionetwork temporary identity (Radio Network Temporary Identity, RNTI)), ora truncated ID.

The HARQ process number field may have 1 to 4 bits for indicating anHARQ process scheduled by the SCI, an HARQ process for the HARQ-ACKfeedback, or a combination thereof.

Second Example

As an SCI instance, the SCI may be used to schedule the PSSCHtransmission, and the actual feedback bits may be reused by the PSSCHfor transmission.

The feedback indication field of the SCI may have 2 bits for indicatingthe quantity of the feedback bits being carried in or reused, as well asan encoding and mapping mode.

When the feedback indication field=0, it means that no feedback bit iscarried in or reused by the PSSCH; when the feedback indication field=1,it means that the quantity of the feedback bits is 1 to 11, and blockencoding is used; when the feedback indication field=2, it means thatthe quantity of the feedback bits is 12 to 19, and polar encoding isused; and when the feedback indication field=3, it means that thequantity of the feedback bits is greater than 20, and polar encoding isused.

The beta-offset indication field in the SCI may be used to indicate abeta-offset configuration used when the feedback bits are mapped to thePSSCH.

The beta-offset may be pre-configured, or configured by the network sidethrough high-layer signaling, or configured by the UE through high-layersignaling. There may exist N sets of configurations, the beta-offsetindication field may have log₂(N) bits, and each value or code point mayindicate one set of beta-offset configurations therein.

Third Example

As an SCI instance, the SCI may be used to schedule the PSSCHtransmission, and the actual feedback bits may be reused by the PSSCHfor transmission or directly carried in the SCI feedback indicationfield.

The feedback indication field in the SCI may have 3 bits, and at most 2feedback bits may be carried.

When a most-significant bit of the feedback indication field is 1, itmeans that the actual feedback bits are carried by two least-significantbits in the feedback indication field, and no feedback bit is carried inthe PSSCH. When the most-significant bit of the feedback indicationfield is 0, it means that the feedback bits are reused by the PSSCH fortransmission, and specific contents may be determined in accordance withcontents of the two least-significant bits. When the twoleast-significant bits are 0, it means that no feedback bit is carriedin or reused by the PSSCH. When the two least-significant bits are 1, itmeans that the quantity of the feedback bits is 1 to 11, and blockencoding is used. When the two least-significant bits are 2, it meansthat the quantity of the feedback bits is 12 to 19, and polar encodingis used. When the two least-significant bits are 3, it means that thequantity of the feedback bits is greater than 20, and polar encoding isused.

The beta-offset indication field in the SCI may be used to indicate abeta-offset configuration used when the feedback bits are mapped to thePSSCH.

The beta-offset may be pre-configured, or configured by the network sidethrough high-layer signaling, or configured by the UE through high-layersignaling. There may exist N sets of configurations, the beta-offsetindication field may have log₂(N) bits, and each value or code point mayindicate one set of beta-offset configurations therein.

Fourth Example

As an SCI instance, the SCI may be used to schedule the PSSCHtransmission, the CSI feedback bits may be reused by the PSSCH fortransmission, and the HARQ-ACK may be directly carried in the SCIfeedback indication field.

The feedback indication field in the SCI may have 4 bits, and at most 2feedback bits may be carried.

Two bits in the feedback indication field (e.g., two most-significantbits) may be actual feedback bits carried in the PSSCH.

The remaining two bits in the feedback indication field (e.g., twoleast-significant bits) may be used to indicate the quantity of CSIfeedback bits carried in or reused by the PSSCH, as well as an encodingand mapping mode for transmission. When the two least-significant bitsare 0, it means that no CSI feedback is carried in or reused by thePSSCH. When the two least-significant bits are 1, it means that thequantity of CSI feedback bits is 1 to 11, and block encoding is used.When the two least-significant bits are 2, it means that the quantity ofCSI feedback bits is 12 to 19, and polar encoding is used. When the twoleast-significant bits are 3, it means that the quantity of CSI feedbackbits is greater than 20, and polar encoding is used.

The beta-offset indication field in the SCI may be used to indicate abeta-offset configuration used when the feedback bits are mapped to thePSSCH.

The beta-offset may be pre-configured, or configured by the network sidethrough high-layer signaling, or configured by the UE through high-layersignaling. There may exist N sets of configurations, the beta-offsetindication field may have log₂(N) bits, and each value or code point mayindicate one set of beta-offset configurations therein.

Fifth Example

As an SCI instance, the SCI may be used to schedule the PSSCHtransmission, the actual feedback bits may be reused by the PSSCH fortransmission, or directly carried in the SCI feedback indication field.

The beta-offset indication field in the SCI may have 3 bits forindicating positions of the feedback bits (whether the feedback bits arereused by the PSSCH or carried in the SCI feedback indication field).

For example, when a most-significant bit in the beta-offset indicationfield is 1, it means that the feedback bits are reused by the PSSCH, andat this time, two least-significant bits may be used to indicate anactually-used beta-offset configuration.

In the case that the most-significant bit in the beta-offset indicationfield is 0, when the two least-significant bits are 0, it means that nofeedback is carried or reused; when the two least-significant bits are1, it means that the feedback bits are carried in the feedbackindication field in the SCI; when the two least-significant bits are 2,it means that the HARQ-ACK feedback is carried in the feedbackindication field in the SCI; and when the two least-significant bits are3, it means that the CSI feedback is carried in the feedback indicationfield in the SCI.

The feedback indication field in the SCI may have 2 bits, and at most 2feedback bits may be carried.

Sixth Example

As an SCI instance, the SCI may be used to schedule the PSSCHtransmission, the actual feedback bits may be reused by the PSSCH fortransmission, or directly carried in the SCI feedback indication field.

The scheduling data indication field in the SCI may have 1 bit. When thebit has one value (e.g., 1), it means that only the feedback bits,rather than the high-layer data, are carried in the PSSCH (i.e., no TBis mapped to the PSSCH), and when the bit has another value (e.g., 0),it means that the feedback bits are reused by the PSSCH and transmittedtogether with the high-layer data or the TB.

The scheduling data indication field in the SCI may also be encodedjointly with the feedback indication field. At this time, it isunnecessary to provide an independent scheduling data indication field,and instead, one value or code point in the feedback indication fieldmay be used to indicate that only the feedback bits are carried in thePSSCH. In this regard, it is able to reduce the bit overhead for theSCI.

Taking the second example as an example, the feedback indication fieldin the SCI may have 2 bits, and one value may be used to indicate thatonly the feedback bits are carried in the PSSCH. When the feedbackindication field=0, it means that no feedback bit is carried in orreused by the PSSCH; when the feedback indication field=1, it means thatonly the feedback bits are carried in the PSSCH; when the feedbackindication field=2, it means that the quantity of the feedback bits is 1to 11 and block encoding is used; and when the feedback indicationfield=3, it means that the quantity of the feedback bits is greater than12 and polar encoding is used.

The scheduling data indication field in the SCI may also be encodedjointly with the beta-offset indication field. At this time, it isunnecessary to provide an independent scheduling data indication field,and instead, one value or code point in the beta-offset indication fieldmay be used to indicate that only the feedback bits are carried in thePSSCH. In this regard, it is able to reduce the bit overhead for theSCI.

Taking the fifth example as an example, as one method, when amost-significant bit of the beta-offset indication field is 0, twoleast-significant bits may be used to indicate that one set ofconfigurations in the actually-used beta-offset configurations is usedto indicate that only the feedback bits are carried in the PSSCH. Asanother method, when the most-significant bit of the beta-offsetindication field is 1, a vale or code point of the two least-significantbits (e.g., when the two least-significant bits=3) may be used toindicate that only the feedback bits are carried in the PSSCH.

The scheduling data indication field in the SCI may also be encodedjointly with a time-domain or frequency-domain resource allocation fieldof the PSSCH scheduled by the SCI. At this time, it is unnecessaryprovide an independent scheduling data indication field, and a set ofsome values or code points in the time-domain or frequency-domainresource allocation field of the PSSCH may be used to indicate that onlythe feedback bits, rather than the high-layer data or a TB, are carriedin the PSSCH scheduled by the SCI.

Seventh Example

As an SCI instance, the acknowledgement request indication field mayhave 2 bits for indicating whether the feedback bits are to betransmitted by a receiving terminal UE and how to transmit the feedbackbits. For example, when the request indication field=0, it means thatthe receiving terminal UE is not required to transmit the feedback bits;when the request indication field=1, it means that the receivingterminal UE is required to transmit all the feedback bits; when therequest indication field=2, it means that the receiving terminal UE isrequired to transmit the CSI feedback bits; and when the requestindication field=3, it means that the receiving terminal UE is requiredto transmit the HARQ-ACK feedback bits.

In a possible embodiment of the present disclosure, the acknowledgementrequest indication field may also be compressed to have 1 bit so as toreduce the overhead. At this time, the acknowledgement requestindication field may be used to indicate a subset of the above contents.

Eighth Example

As an SCI instance, the measurement configuration indication field mayhave 1 or 2 bits. When the bit has one value (e.g., 0), it means thatthe measurement configuration is not enabled and the measurement resultis not fed back, and when the bit has another value, it means that themeasurement configuration is enabled. Different values may representdifferent measurement configurations. The specific measurementconfiguration may be pre-configured, or configured by the network sidethrough high-layer signaling, or configured by the UE through sidelinkbroadcasting.

Ninth Example

As an SCI instance, the reference signal indication field may have 1 to2 bits. When the bit has one value (e.g., 0), it means that themeasurement reference signal is not transmitted, and when the bit hasanother value, it means that the measurement reference signal is enabledto be transmitted. Different values may represent different referencesignal configurations. The specific reference signal configuration maybe pre-configured, or configured by the network side through high-layersignaling, or configured by the UE through sidelink broadcasting.

Once the measurement reference signal has been transmitted, it meansthat the reference signal is reused by the PSSCH for transmission, and aresource mapping of the PSSCH needs to avoid a time-frequency positionof the reference signal.

Tenth Example

As an SCI example, the measurement configuration indication field may beencoded jointly with the reference signal indication field, and it mayhave 1 to 2 bits. When the bit has one value (e.g., 0), it means thatthe measurement reference signal is not transmitted and the measurementconfiguration is not enabled, and when the bit has another value, itmeans that the measurement reference signal is enabled to betransmitted. Different values may represent different combinations ofthe reference signal configurations and the measurement configurations.The specific configuration combination may be pre-configured, orconfigured by the network side through high-layer signaling, orconfigured by the UE through sidelink broadcasting.

According to the embodiments of the present disclosure, the SCI may betransmitted through the PSCCH of the sidelink, the SCI may include theinformation field, and the information field may be used to indicate thephysical layer information of the sidelink. As a result, it is ableimprove the sidelink transmission performance.

As shown in FIG. 3 , the present disclosure further provides in anembodiment another sidelink transmission method operable by a secondterminal, which includes Step 301 of receiving SCI through a PSCCH of asidelink. The SCI includes an information field, and the informationfield is used to indicate physical layer information of the sidelink.

In a possible embodiment of the present disclosure, the physical layerinformation may include at least one of feedback information, abeta-offset indicator, a scheduling data indicator, an acknowledgementrequest indicator, a measurement configuration, a reference signalindicator, a feedback object indicator and an HARQ process indicator.

In a possible embodiment of the present disclosure, the informationfield may include at least one of a feedback indication field, abeta-offset indication field, a scheduling data indication field, anacknowledgement request indication field, a measurement configurationindication field, a reference signal indication field, a feedback objectindication field and an HARQ process number field.

In a possible embodiment of the present disclosure, the feedbackindication field may include a predefined value or a predefined codepoint, and the predefined value or the predefined code point mayrepresent that the feedback information is not carried in the SCI or thePSSCH scheduled by the SCI; or the feedback indication field may includea feedback bit representing the feedback information; or the feedbackindication field may include a value in a predefined set, and the valuemay represent that the feedback information is carried in or reused bythe PSSCH scheduled by the SCI.

In a possible embodiment of the present disclosure, in the case that thequantity of the feedback bits of the feedback information is smallerthan a specific threshold, the feedback indication field may include thefeedback bits, and in the case that the quantity of the feedback bits ofthe feedback information is greater than or equal to the specificthreshold, the feedback indication field may include the value in thepredefined set.

In a possible embodiment of the present disclosure, the feedbackinformation may include at least one of retransmission acknowledgmentinformation and a CSI measurement result.

In a possible embodiment of the present disclosure, an encoding andmapping mode of the feedback information in the PSSCH may correspond tothe value, and/or the quantity of the feedback bits of the feedbackinformation in the PSSCH may correspond to the value.

In a possible embodiment of the present disclosure, in the case that thefeedback information is carried in or reused by the PSSCH scheduled bythe SCI, the beta-offset indication field may be used to indicate abeta-offset configuration used for bit mapping of the PSSCH; or thebeta-offset indication field may include a predefined value or apredefined code point, and the predefined value or the predefined codepoint may represent that the feedback information is not carried in theSCI or the PSSCH scheduled by the SCI; or in the case that a valuecomprised in the beta-offset indication field belongs to a firstpredefined sub-space, the beta-offset indication field may be used toindicate that the feedback indication field includes the feedback bitsand indicate the beta-offset configuration used for the bit mapping ofthe PSSCH; or in the case that the value of the beta-offset indicationfield belongs to a second predefined sub-space, the beta-offsetindication field may be used to indicate a specific feedback mode.

In a possible embodiment of the present disclosure, the specificfeedback mode may include a mode that the feedback indication fieldincludes the predefined value or the predefined code point, a mode thatthe feedback indication field includes feedback information of aspecific type, or a mode that whether only the feedback bits, ratherthan high-layer data or a TB, are carried in the PSSCH scheduled by theSCI.

In a possible embodiment of the present disclosure, the scheduling dataindication field may be used to indicate whether only the feedback bits,rather than the high-layer data or a TB, are carried in the PSSCHscheduled by the SCI, the scheduling data indication field may be afield independent of another field in the SCI, or the scheduling dataindication field may be at least one value or code point in the otherfield, the other field may be a PSSCH time-domain or frequency-domainresource allocation field, the feedback indication field, thebeta-offset indication field, the acknowledge request indication field,the measurement configuration indication field, the reference signalindication field, the feedback object indication field information, orthe HARQ process number field; or the acknowledgement request indicationfield may be used to indicate whether to transmit acknowledgementfeedback by a receiving terminal with respect to the PSSCH scheduled bythe SCI, and the receiving terminal may be a terminal which receives thePSSCH; or the measurement configuration indication field may be used toindicate whether to enable sidelink channel measurement and indicate ameasurement configuration for the sidelink channel measurement; or thereference signal indication field may be used to indicate whether toenable sidelink reference signal measurement, and indicate a referencesignal configuration of a sidelink measurement reference signal, whereinwhen the sidelink reference signal measurement is enabled, a resourcemapping position of the PSSCH scheduled by the SCI may not overlap witha resource position of the reference signal; or the feedback objectindication field may be used to indicate an ID of a receiving terminal,a group ID of the receiving terminal, a fixed ID of the receivingterminal allocated by a network, a temporary ID or a truncated ID of thereceiving terminal allocated by the network, and the receiving terminalmay be a terminal that performs feedback; or the HARQ process numberfield may be used to indicate at least one of an HARQ process for theSCI-scheduling data and an HARQ process for HARQ-ACK feedback.

In a possible embodiment of the present disclosure, the measurementconfiguration indication field and the reference signal indication fieldmay be encoded jointly.

In a possible embodiment of the present disclosure, at least one fieldcomprised in the information field is indicated throughpre-configuration, or RRC signaling configuration by a network side, orsidelink broadcasting configuration.

It should be appreciated that, this embodiment may be an implementationof the second terminal corresponding to the embodiment as shown in FIG.2 , and the implementation of this embodiment may refer to that in theembodiment as shown in FIG. 2 with a same beneficial effect, which willnot be particularly defined herein to avoid repeated recitation.

As shown in FIG. 4 , the present disclosure further provides in anembodiment a terminal 400 which is a first terminal. The terminal 400includes a transmission module 401 configured to transmit SCI through aPSCCH of a sidelink. The SCI includes an information field, and theinformation field is used to indicate physical layer information of thesidelink.

In a possible embodiment of the present disclosure, the physical layerinformation may include at least one of feedback information, abeta-offset indicator, a scheduling data indicator, an acknowledgementrequest indicator, a measurement configuration, a reference signalindicator, a feedback object indicator and an HARQ process indicator.

In a possible embodiment of the present disclosure, the informationfield may include at least one of a feedback indication field, abeta-offset indication field, a scheduling data indication field, anacknowledgement request indication field, a measurement configurationindication field, a reference signal indication field, a feedback objectindication field and an HARQ process number field.

In a possible embodiment of the present disclosure, the feedbackindication field may include a predefined value or a predefined codepoint, and the predefined value or the predefined code point mayrepresent that the feedback information is not carried in the SCI or thePSSCH scheduled by the SCI; or the feedback indication field may includefeedback bits representing the feedback information; or the feedbackindication field may include a value in a predefined set, and the valuemay represent that the feedback information is carried in or reused bythe PSSCH scheduled by the SCI.

In a possible embodiment of the present disclosure, in the case that thequantity of the feedback bits of the feedback information is smallerthan a specific threshold, the feedback indication field may include thefeedback bits, and in the case that the quantity of the feedback bits ofthe feedback information is greater than or equal to the specificthreshold, the feedback indication field may include the value in thepredefined set.

In a possible embodiment of the present disclosure, the feedbackinformation may include at least one of retransmission acknowledgmentinformation and a CSI measurement result.

In a possible embodiment of the present disclosure, an encoding andmapping mode of the feedback information in the PSSCH may correspond tothe value, and/or the quantity of the feedback bits of the feedbackinformation in the PSSCH may correspond to the value.

In a possible embodiment of the present disclosure, in the case that thefeedback information is carried in or reused by the PSSCH scheduled bythe SCI, the beta-offset indication field may be used to indicate abeta-offset configuration used for bit mapping of the PSSCH; or thebeta-offset indication field may include a predefined value or apredefined code point, and the predefined value or the predefined codepoint may represent that the feedback information is not carried in theSCI or the PSSCH scheduled by the SCI; or in the case that a valuecomprised in the beta-offset indication field belongs to a firstpredefined sub-space, the beta-offset indication field may be used toindicate that the feedback indication field includes the feedback bitsand indicate the beta-offset configuration used for the bit mapping ofthe PSSCH; or in the case that the value of the beta-offset indicationfield belongs to a second predefined sub-space, the beta-offsetindication field may be used to indicate a specific feedback mode.

In a possible embodiment of the present disclosure, the specificfeedback mode may include a mode that the feedback indication fieldincludes the predefined value or the predefined code point, or a modethat the feedback indication field includes feedback information of aspecific type, or a mode that whether only the feedback bits, ratherthan high-layer data or a TB, are carried in the PSSCH scheduled by theSCI.

In a possible embodiment of the present disclosure, the scheduling dataindication field may be used to indicate whether only the feedback bits,rather than the high-layer data or a TB, are carried in the PSSCHscheduled by the SCI, the scheduling data indication field may be afield independent of another field in the SCI, or the scheduling dataindication field may be at least one value or code point in the otherfield, the other field may be a PSSCH time-domain or frequency-domainresource allocation field, the feedback indication field, thebeta-offset indication field, the acknowledge request indication field,the measurement configuration indication field, the reference signalindication field, the feedback object indication field, or the HARQprocess number field; or the acknowledgement request indication fieldmay be used to indicate whether to transmit acknowledgement feedback bya receiving terminal with respect to the PSSCH scheduled by the SCI, andthe receiving terminal may be a terminal which receives the PSSCH; orthe measurement configuration indication field may be used to indicatewhether to enable sidelink channel measurement and indicate ameasurement configuration for the sidelink channel measurement; or thereference signal indication field may be used to indicate whether toenable sidelink reference signal measurement, and indicate a referencesignal configuration of a sidelink measurement reference signal, whereinwhen the sidelink reference signal measurement is enabled, a resourcemapping position of the PSSCH scheduled by the SCI may not overlap witha resource position of the reference signal; or the feedback objectindication field may be used to indicate an ID of a receiving terminal,a group ID of the receiving terminal, a fixed ID of the receivingterminal allocated by a network, a temporary ID or a truncated ID of thereceiving terminal allocated by the network, and the receiving terminalmay be a terminal that performs feedback; or the HARQ process numberfield may be used to indicate at least one of an HARQ process for theSCI-scheduling data and an HARQ process for HARQ-ACK feedback.

In a possible embodiment of the present disclosure, the measurementconfiguration indication field and the reference signal indication fieldmay be encoded jointly.

In a possible embodiment of the present disclosure, at least one fieldcomprised in the information field is indicated throughpre-configuration, or RRC signaling configuration by a network side, orsidelink broadcasting configuration.

The terminal in the embodiments of the present disclosure is capable ofimplementing the procedures for the first terminal in the methodembodiments as shown in FIG. 2 , which will not be particularly definedherein to avoid repeated recitation. It is able to improve the sidelinktransmission performance.

As shown in FIG. 5 , the present disclosure further provides in anembodiment a terminal 500 which is a second terminal. The terminal 500includes a reception module 501 configured to receive SCI through aPSCCH of a sidelink. The SCI includes an information field, and theinformation field is used to indicate physical layer information of thesidelink.

In a possible embodiment of the present disclosure, the physical layerinformation may include at least one of feedback information, abeta-offset indicator, a scheduling data indicator, an acknowledgementrequest indicator, a measurement configuration, a reference signalindicator, a feedback object indicator and an HARQ process indicator.

In a possible embodiment of the present disclosure, the informationfield may include at least one of a feedback indication field, abeta-offset indication field, a scheduling data indication field, anacknowledgement request indication field, a measurement configurationindication field, a reference signal indication field, a feedback objectindication field and an HARQ process number field.

In a possible embodiment of the present disclosure, the feedbackindication field may include a predefined value or a predefined codepoint, and the predefined value or the predefined code point mayrepresent that the feedback information is not carried in the SCI or thePSSCH scheduled by the SCI; or the feedback indication field may includefeedback bits representing the feedback information; or the feedbackindication field may include a value in a predefined set, and the valuemay represent that the feedback information is carried in or reused bythe PSSCH scheduled by the SCI.

In a possible embodiment of the present disclosure, in the case that thequantity of the feedback bits of the feedback information is smallerthan a specific threshold, the feedback indication field may include thefeedback bits, and in the case that the quantity of the feedback bits ofthe feedback information is greater than or equal to the specificthreshold, the feedback indication field may include the value in thepredefined set.

In a possible embodiment of the present disclosure, the feedbackinformation may include at least one of retransmission acknowledgmentinformation and a CSI measurement result.

In a possible embodiment of the present disclosure, an encoding andmapping mode of the feedback information in the PSSCH may correspond tothe value, and/or the quantity of the feedback bits of the feedbackinformation in the PSSCH may correspond to the value.

In a possible embodiment of the present disclosure, in the case that thefeedback information is carried in or reused by the PSSCH scheduled bythe SCI, the beta-offset indication field may be used to indicate abeta-offset configuration used for bit mapping of the PSSCH; or thebeta-offset indication field may include a predefined value or apredefined code point, and the predefined value or the predefined codepoint may represent that the feedback information is not carried in theSCI or the PSSCH scheduled by the SCI; or in the case that a valuecomprised in the beta-offset indication field belongs to a firstpredefined sub-space, the beta-offset indication field may be used toindicate that the feedback indication field includes the feedback bitsand indicate the beta-offset configuration used for the bit mapping ofthe PSSCH; or in the case that the value of the beta-offset indicationfield belongs to a second predefined sub-space, the beta-offsetindication field may be used to indicate a specific feedback mode.

In a possible embodiment of the present disclosure, the specificfeedback mode may include a mode that the feedback indication fieldincludes the predefined value or the predefined code point, a mode thatthe feedback indication field includes feedback information of aspecific type, or a mode that whether only the feedback bits, ratherthan high-layer data or a TB, are carried in the PSSCH scheduled by theSCI.

In a possible embodiment of the present disclosure, the scheduling dataindication field may be used to indicate whether only the feedback bits,rather than the high-layer data or a TB, are carried in the PSSCHscheduled by the SCI, the scheduling data indication field may be afield independent of another field in the SCI, or the scheduling dataindication field may be at least one value or code point in the otherfield, the other field may be a PSSCH time-domain or frequency-domainresource allocation field, the feedback indication field, thebeta-offset indication field, the acknowledge request indication field,the measurement configuration indication field, the reference signalindication field, the feedback object indication field information, orthe HARQ process number field; or the acknowledgement request indicationfield may be used to indicate whether to transmit acknowledgementfeedback by a receiving terminal with respect to the PSSCH scheduled bythe SCI, and the receiving terminal may be a terminal which receives thePSSCH; or the measurement configuration indication field may be used toindicate whether to enable sidelink channel measurement and indicate ameasurement configuration for the sidelink channel measurement; or thereference signal indication field may be used to indicate whether toenable sidelink reference signal measurement, and indicate a referencesignal configuration of a sidelink measurement reference signal, whereinwhen the sidelink reference signal measurement is enabled, a resourcemapping position of the PSSCH scheduled by the SCI may not overlap witha resource position of the reference signal;

or the feedback object indication field may be used to indicate an ID ofa receiving terminal, a group ID of the receiving terminal, a fixed IDof the receiving terminal allocated by a network, a temporary ID or atruncated ID of the receiving terminal allocated by the network, and thereceiving terminal may be a terminal that performs feedback; or the HARQprocess number field may be used to indicate at least one of an HARQprocess for the SCI-scheduling data and an HARQ process for HARQ-ACKfeedback.

In a possible embodiment of the present disclosure, the measurementconfiguration indication field and the reference signal indication fieldmay be encoded jointly.

In a possible embodiment of the present disclosure, at least one fieldcomprised in the information field is indicated throughpre-configuration, or RRC signaling configuration by a network side, orsidelink broadcasting configuration.

The terminal in the embodiments of the present disclosure is capable ofimplementing the procedures for the second terminal in the methodembodiments as shown in FIG. 3 , which will not be particularly definedherein to avoid repeated recitation. It is able to improve the sidelinktransmission performance.

FIG. 6 is a structure schematic view showing a hardware structure of aterminal according to an embodiment of the present disclosure. Theterminal 600 includes, but not limited to, a Radio Frequency (RF) unit601, a network module 602, an audio output unit 603, an input unit 604,a sensor 605, a display unit 606, a user input unit 607, an interfaceunit 608, a memory 609, a processor 610, and a power source 611. Itshould be appreciated that, the terminal may not be limited to thestructure in FIG. 6 , i.e., it may include more or fewer members, orsome members may be combined, or the members may be arranged indifferent modes. In the embodiments of the present disclosure, theterminal may include, but not limited to, mobile phone, flat-panelcomputer, notebook computer, palmtop computer, vehicle-mounted terminal,wearable device and pedometer.

In a possible embodiment of the present disclosure, in the case that theterminal is the first terminal defined in the embodiments of the presentdisclosure, the radio frequency unit 60 is configured to transmit SCIthrough a PSCCH of a sidelink. The SCI includes an information field,and the information field is used to indicate physical layer informationof the sidelink.

In a possible embodiment of the present disclosure, the physical layerinformation may include at least one of feedback information, abeta-offset indicator, a scheduling data indicator, an acknowledgementrequest indicator, a measurement configuration, a reference signalindicator, a feedback object indicator and an HARQ process indicator.

In a possible embodiment of the present disclosure, the informationfield may include at least one of a feedback indication field, abeta-offset indication field, a scheduling data indication field, anacknowledgement request indication field, a measurement configurationindication field, a reference signal indication field, a feedback objectindication field and an HARQ process number field.

In a possible embodiment of the present disclosure, the feedbackindication field may include a predefined value or a predefined codepoint, and the predefined value or the predefined code point mayrepresent that the feedback information is not carried in the SCI or thePSSCH scheduled by the SCI; or the feedback indication field may includefeedback bits representing the feedback information; or the feedbackindication field may include a value in a predefined set, and the valuemay represent that the feedback information is carried in or reused bythe PSSCH scheduled by the SCI.

In a possible embodiment of the present disclosure, in the case that thequantity of the feedback bits of the feedback information is smallerthan a specific threshold, the feedback indication field may include thefeedback bits, and in the case that the quantity of the feedback bits ofthe feedback information is greater than or equal to the specificthreshold, the feedback indication field may include the value in thepredefined set.

In a possible embodiment of the present disclosure, the feedbackinformation may include at least one of retransmission acknowledgmentinformation and a CSI measurement result.

In a possible embodiment of the present disclosure, an encoding andmapping mode of the feedback information in the PSSCH may correspond tothe value, and/or the quantity of the feedback bits of the feedbackinformation in the PSSCH may correspond to the value.

In a possible embodiment of the present disclosure, in the case that thefeedback information is carried in or reused by the PSSCH scheduled bythe SCI, the beta-offset indication field may be used to indicate abeta-offset configuration used for bit mapping of the PSSCH; or thebeta-offset indication field may include a predefined value or apredefined code point, and the predefined value or the predefined codepoint may represent that the feedback information is not carried in theSCI or the PSSCH scheduled by the SCI; or in the case that a valuecomprised in the beta-offset indication field belongs to a firstpredefined sub-space, the beta-offset indication field may be used toindicate that the feedback indication field includes the feedback bitsand indicate the beta-offset configuration used for the bit mapping ofthe PSSCH; or in the case that the value of the beta-offset indicationfield belongs to a second predefined sub-space, the beta-offsetindication field may be used to indicate a specific feedback mode.

In a possible embodiment of the present disclosure, the specificfeedback mode may include a mode that the feedback indication fieldincludes the predefined value or the predefined code point, or a modethat the feedback indication field includes feedback information of aspecific type, or a mode that whether only the feedback bits, ratherthan high-layer data or a TB, are carried in the PSSCH scheduled by theSCI.

In a possible embodiment of the present disclosure, the scheduling dataindication field may be used to indicate whether only the feedback bits,rather than the high-layer data or a TB, are carried in the PSSCHscheduled by the SCI, the scheduling data indication field may be afield independent of another field in the SCI, or the scheduling dataindication field may be at least one value or code point in the otherfield, the other field may be a PSSCH time-domain or frequency-domainresource allocation field, the feedback indication field, thebeta-offset indication field, the acknowledge request indication field,the measurement configuration indication field, the reference signalindication field, the feedback object indication field information, orthe HARQ process number field; or the acknowledgement request indicationfield may be used to indicate whether to transmit acknowledgementfeedback by a receiving terminal with respect to the PSSCH scheduled bythe SCI, and the receiving terminal may be a terminal which receives thePSSCH; or the measurement configuration indication field may be used toindicate whether to enable sidelink channel measurement and indicate ameasurement configuration for the sidelink channel measurement; or thereference signal indication field may be used to indicate whether toenable sidelink reference signal measurement, and indicate a referencesignal configuration of a sidelink measurement reference signal, whereinwhen the sidelink reference signal measurement is enabled, a resourcemapping position of the PSSCH scheduled by the SCI may not overlap witha resource position of the reference signal; or the feedback objectindication field may be used to indicate an ID of a receiving terminal,a group ID of the receiving terminal, a fixed ID of the receivingterminal allocated by a network, a temporary ID or a truncated ID of thereceiving terminal allocated by the network, and the receiving terminalmay be a terminal that performs feedback; or the HARQ process numberfield may be used to indicate at least one of an HARQ process for theSCI-scheduling data and an HARQ process for HARQ-ACK feedback.

In a possible embodiment of the present disclosure, the measurementconfiguration indication field and the reference signal indication fieldmay be encoded jointly.

In a possible embodiment of the present disclosure, at least one fieldcomprised in the information field is indicated throughpre-configuration, or RRC signaling configuration by a network side, orsidelink broadcasting configuration.

In another possible embodiment of the present disclosure, in the casethat the terminal is the second terminal defined in the embodiments ofthe present disclosure, the radio frequency unit 601 is configured toreceive SCI through a PSCCH of a sidelink. The SCI includes aninformation field, and the information field is used to indicatephysical layer information of the sidelink.

In a possible embodiment of the present disclosure, the physical layerinformation may include at least one of feedback information, abeta-offset indicator, a scheduling data indicator, an acknowledgementrequest indicator, a measurement configuration, a reference signalindicator, a feedback object indicator and an HARQ process indicator.

In a possible embodiment of the present disclosure, the informationfield may include at least one of a feedback indication field, abeta-offset indication field, a scheduling data indication field, anacknowledgement request indication field, a measurement configurationindication field, a reference signal indication field, a feedback objectindication field and an HARQ process number field.

In a possible embodiment of the present disclosure, the feedbackindication field may include a predefined value or a predefined codepoint, and the predefined value or the predefined code point mayrepresent that the feedback information is not carried in the SCI or thePSSCH scheduled by the SCI; or the feedback indication field may includefeedback bits representing the feedback information; or the feedbackindication field may include a value in a predefined set, and the valuemay represent that the feedback information is carried in or reused bythe PSSCH scheduled by the SCI.

In a possible embodiment of the present disclosure, in the case that thequantity of the feedback bits of the feedback information is smallerthan a specific threshold, the feedback indication field may include thefeedback bits, and in the case that the quantity of the feedback bits ofthe feedback information is greater than or equal to the specificthreshold, the feedback indication field may include the value in thepredefined set.

In a possible embodiment of the present disclosure, the feedbackinformation may include at least one of retransmission acknowledgmentinformation and a CSI measurement result.

In a possible embodiment of the present disclosure, an encoding andmapping mode of the feedback information in the PSSCH may correspond tothe value, and/or the quantity of the feedback bits of the feedbackinformation in the PSSCH may correspond to the value.

In a possible embodiment of the present disclosure, in the case that thefeedback information is carried in or reused by the PSSCH scheduled bythe SCI, the beta-offset indication field may be used to indicate abeta-offset configuration used for bit mapping of the PSSCH; or thebeta-offset indication field may include a predefined value or apredefined code point, and the predefined value or the predefined codepoint may represent that the feedback information is not carried in theSCI or the PSSCH scheduled by the SCI; or in the case that a valuecomprised in the beta-offset indication field belongs to a firstpredefined sub-space, the beta-offset indication field may be used toindicate that the feedback indication field includes the feedback bitsand indicate the beta-offset configuration used for the bit mapping ofthe PSSCH; or in the case that the value of the beta-offset indicationfield belongs to a second predefined sub-space, the beta-offsetindication field may be used to indicate a specific feedback mode.

In a possible embodiment of the present disclosure, the specificfeedback mode may include a mode that the feedback indication fieldincludes the predefined value or the predefined code point, or a modethat the feedback indication field includes feedback information of aspecific type, or a mode that whether only the feedback bits, ratherthan high-layer data or a TB, are carried in the PSSCH scheduled by theSCI.

In a possible embodiment of the present disclosure, the scheduling dataindication field may be used to indicate whether only the feedback bits,rather than the high-layer data or a TB, are carried in the PSSCHscheduled by the SCI, the scheduling data indication field may be afield independent of another field in the SCI, or the scheduling dataindication field may be at least one value or code point in the otherfield, the other field may be a PSSCH time-domain or frequency-domainresource allocation field, the feedback indication field, thebeta-offset indication field, the acknowledge request indication field,the measurement configuration indication field, the reference signalindication field, the feedback object indication field information, orthe HARQ process number field; or the acknowledgement request indicationfield may be used to indicate whether to transmit acknowledgementfeedback by a receiving terminal with respect to the PSSCH scheduled bythe SCI, and the receiving terminal may be a terminal which receives thePSSCH; or the measurement configuration indication field may be used toindicate whether to enable sidelink channel measurement and indicate ameasurement configuration for the sidelink channel measurement; or thereference signal indication field may be used to indicate whether toenable sidelink reference signal measurement, and indicate a referencesignal configuration of a sidelink measurement reference signal, whereinwhen the sidelink reference signal measurement is enabled, a resourcemapping position of the PSSCH scheduled by the SCI may not overlap witha resource position of the reference signal; or the feedback objectindication field may be used to indicate an ID of a receiving terminal,a group ID of the receiving terminal, a fixed ID of the receivingterminal allocated by a network, a temporary ID or a truncated ID of thereceiving terminal allocated by the network, and the receiving terminalmay be a terminal that performs feedback; or the HARQ process numberfield may be used to indicate at least one of an HARQ process for theSCI-scheduling data and an HARQ process for HARQ-ACK feedback.

In a possible embodiment of the present disclosure, the measurementconfiguration indication field and the reference signal indication fieldmay be encoded jointly.

In a possible embodiment of the present disclosure, at least one fieldcomprised in the information field is indicated throughpre-configuration, or RRC signaling configuration by a network side, orsidelink broadcasting configuration.

According to the terminals in the above embodiments of the presentdisclosure, it is able to improve the sidelink transmission performance.

It should be appreciated that, in the embodiments of the presentdisclosure, the radio frequency unit 601 may transmit and receivesignals during the information transmission or phone call. To bespecific, the radio frequency unit 601 may, upon the receipt of downlinkdata from a base station, transmit the downlink data to the processor610 for subsequent treatment. In addition, the radio frequency unit 601may transmit uplink data to the base station. Usually, the radiofrequency unit 601 may include, but not limited to, an antenna, at leastone amplifier, a transceiver, a coupler, a low-noise amplifier and aduplexer. In addition, the radio frequency unit 601 may communicate witha network and another device via a wireless communications system.

The network module 602 is configured to enable the terminal to accessthe broadband Internet in a wireless manner, e.g., help a user toreceive and send an e-mail, browse a web page or access a streamingmedia.

The audio output unit 603 is configured to convert audio data receivedby the radio frequency unit 601 or the network module 602, or audio datastored in the memory 609, into an audio signal and output the audiosignal as a sound. In addition, the audio output unit 603 is furtherconfigured to provide an audio output related to a specific functionexecuted by the terminal 600 (e.g., a sound occurring when a callingsignal or a message has been received). The audio output unit 603 mayinclude a loudspeaker, a buzzer and a receiver.

The input unit 604 is configured to receive an audio or video signal.The input unit 604 may include a graphics processing unit (GraphicsProcessing Unit, GPU) 6041 and a microphone 6042. The GPU 6041 isconfigured to process image data of a static image or video acquired byan image collection unit (e.g., a camera) in a video capturing mode oran image capturing mode, and a processed image frame may be displayed bythe display unit 606. The image frame processed by the GPU 6041 may bestored in the memory 609 (or another storage medium) or transmitted viathe radio frequency unit 601 or network module 602. The microphone 6042is configured to receive a sound, and convert the sound into voice data.In a call mode, the processed audio data may be converted into data in aformat capable of being transmitted by the radio frequency unit 601 to amobile communication base station.

The terminal 600 may further include at least one sensor 605, which mayinclude a light sensor, a movement sensor and the other sensors. To bespecific, the light sensor may include an ambient light sensor or aproximity sensor. The ambient light sensor is configured to adjust abrightness value of a display panel 6061 in accordance with ambientlight. The proximity sensor is configured to turn off the display panel6061 and/or a backlight source when the terminal 600 moves close to anear. As one of the movement sensors, an accelerometer may detectacceleration in various directions (usually a three-axis accelerometer),and detect a level and a direction of a gravity force in a static state.Through the accelerometer, it is able to identify a posture of the UE(e.g., perform a switching operation between portrait and landscapeorientations, play relevant games, and calibrate a posture of amagnetometer), and perform vibration-related functions (e.g., countsteps and strikes). The sensor 605 may further include a fingerprintsensor, a pressure sensor, an iris sensor, a molecule sensor, agyroscope, a barometer, a hygrometer, a thermometer or an infraredsensor, which will not be limited thereto.

The display unit 606 is configured to display information inputted bythe user or provided to the user. The display unit 606 may include thedisplay panel 6061, e.g., a liquid crystal display (Liquid CrystalDisplay, LCD) panel, or an organic light-emitting diode (OrganicLight-Emitting Diode, OLED) panel.

The user input unit 607 is configured to receive digital or characterinformation being inputted, and generate a key signal input related touser settings and function control of the terminal. To be specific, theuser input unit 607 may include a touch panel 6071 and another inputdevice 6072. The touch panel 6071, also called as touch screen, isconfigured to collect a touch operation made by the user on or inproximity to the touch panel (e.g., an operation made by the userthrough any appropriate object or attachment (e.g., finger or stylus) onor in the proximity to the touch panel 6071). The touch panel 6071 mayinclude a touch detection unit and a touch controller. The touchdetection unit is configured to detect a touch position of the user anda signal generated due to the touch operation, and transmit the signalto the touch controller. The touch controller is configured to receivetouch information from the touch detection unit, convert it intocoordinates of a touch point, transmit the coordinates to the processor610, and receive and execute a command from the processor 610. Inaddition, the touch panel 6071 may be of a resistive type, a capacitivetype, an infrared type or a surface acoustic wave (SAW) type. Besidesthe touch panel 6071, the user input unit 607 may further includeanother input device 6072, which may include, but not limited to, aphysical keyboard, a functional button (e.g., a volume control button oran on/off button), a trackball, a mouse, and a joystick, which will notbe limited thereto.

Further, the touch panel 6071 may cover the display panel 6061. When thetouch operation made on or in proximity to the touch panel 6071 has beendetected, the touch panel 6071 may transmit the touch information to theprocessor 610, so as to determine a type of a touch event. Then, theprocessor 610 may control the display panel 6061 to provide acorresponding visual output in accordance with the type of the touchevent. Although the touch panel 6071 and the display panel 6061 areconfigured as two separate members in FIG. 6 for implementing the inputand the out functions, in an embodiment of the present disclosure, thetouch panel 6071 and the display panel 6061 may be integrated so as toachieve the input and output functions of the terminal, which will notbe particularly defined herein.

The interface unit 608 is configured to provide an interface between anexternal device and the terminal 600. For example, the external devicemay include a wired or wireless headset port, an external power sourceport (or a battery charging port), a wired or wireless data port, amemory card port, a port for a device having an identification module,an audio input/output (I/O) port, a video I/O port, and an earphoneport. The interface unit 608 is configured to receive an input from theexternal device (e.g., data information and electricity) and transmitthe input to one or more elements of the terminal 600, or transmit databetween the terminal 600 and the external device.

The memory 609 is configured to store therein a software application andvarious data. The memory 609 may mainly include an application storagearea and a data storage area. An Operating System (OS) and at least oneapplication for the functions (e.g., an audio/image playing function)may be stored in the application storage area. Data created inaccordance with the operation of the mobile phone (e.g., audio data andphonebook) may be stored in the data storage area. In addition, thememory 609 may include a high-speed random access memory, or anon-volatile memory, such as at least one disk storage device, flashstorage device, or other volatile solid storage device.

As a control center of the terminal, the processor 610 may be connectedto the other members of the terminal via various interfaces andcircuits, and configured to run or execute the software program and/ormodule stored in the memory 609, and call the data stored in the memory609, so as to execute the functions of the terminal and process thedata, thereby to monitor the entire terminal. The processor 610 mayinclude one or more processing units. In a possible embodiment of thepresent disclosure, an application processor and a modem may beintegrated into the processor 610. The application processor is mainlyconfigured to process the operating system, a user interface and theapplication. The modem is mainly configured to process wirelesscommunication. It should be appreciated that, the modem mayalternatively not be integrated into the processor 610.

The power source 611 (e.g., a battery) is configured to supply power tothe members of the terminal 600. In a possible embodiment of the presentdisclosure, the power source 611 is logically connected to the processor610 via a power source management system, so as to achieve suchfunctions as charging, discharging and power consumption managementthrough the power source management system.

In addition, the terminal 600 may include some functional modules beingnot shown, which will not be particularly defined herein.

In a possible embodiment of the present disclosure, the presentdisclosure further provides a terminal, which includes a processor 610,a memory 609, and a computer program stored in the memory 609 andcapable of being executed by the processor 610. The processor 610 isconfigured to execute the computer program so as to implement theabove-mentioned sidelink transmission method for the first terminal orimplement the above-mentioned sidelink transmission method for thesecond terminal with a same technical effect, which will not beparticularly defined herein to avoid repeated recitation.

The present disclosure further provides in an embodiment acomputer-readable storage medium storing therein a computer program. Thecomputer program is executed by a processor, so as to implement theabove-mentioned sidelink transmission method for the first terminal orimplement the above-mentioned sidelink transmission method for thesecond terminal with a same technical effect, which will not beparticularly defined herein to avoid repeated recitation. Thecomputer-readable storage medium may be a read-only memory (Read-OnlyMemory, ROM), a random access memory (Random Access Memory, RAM), amagnetic disk or an optical disk.

It should be appreciated that, such words as “include” or “including” orany other variations involved in the present disclosure intend toprovide non-exclusive coverage, so that a procedure, method, article ordevice including a series of elements may also include other elementsnot listed herein, or may include inherent elements of the procedure,method, article or device. If without any further limitations, for theelements defined by such sentence as “including one . . . ”, it is notexcluded that the procedure, method, article or device including theelements may also include other identical elements.

Through the above-mentioned description, it may be apparent for a personskilled in the art that the present disclosure may be implemented bysoftware as well as a necessary common hardware platform, or byhardware, and the former may be better in most cases. Based on this, thetechnical solutions of the present disclosure, essentially, or parts ofthe technical solutions of the present disclosure contributing to theprior art, may appear in the form of software products, which may bestored in a storage medium (e.g., ROM/RAM, magnetic disk or opticaldisk) and include instructions so as to enable a terminal device (e.g.,mobile phone, computer, server, air conditioner or network device) toexecute the method in the embodiments of the present disclosure.

The embodiments of the present disclosure have been described above withreference to the drawings, but the present disclosure is not limited tothe above-mentioned specific embodiments. The above-mentioned specificembodiments are only illustrative and not restrictive. Under theteaching of the present disclosure, a person skilled in the art may makemany modifications without departing from the principle of the presentdisclosure and the scope of protection of the claims, all of which fallwithin the protection of the present disclosure.

What is claimed is:
 1. A sidelink transmission method, operable by asecond terminal, comprising: receiving Sidelink Control Information(SCI) through a Physical Sidelink Control Channel (PSCCH) of a sidelink,wherein the SCI comprises an information field, and the informationfield is used to indicate physical layer information of the sidelink. 2.The sidelink transmission method according to claim 1, wherein thephysical layer information comprises at least one of: feedbackinformation, a beta-offset indicator, a scheduling data indicator, anacknowledgement request indicator, a measurement configuration, areference signal indicator, a feedback object indicator and a HybridAutomatic Repeat Request (HARQ) process indicator.
 3. The sidelinktransmission method according to claim 1, wherein the information fieldcomprises at least one of: a feedback indication field, a beta-offsetindication field, a scheduling data indication field, an acknowledgementrequest indication field, a measurement configuration indication field,a reference signal indication field, a feedback object indication fieldand an HARQ process number field.
 4. The sidelink transmission methodaccording to claim 3, wherein the feedback indication field comprises apredefined value or a predefined code point, and the predefined value orthe predefined code point represents that the feedback information isnot carried in the SCI or the PSSCH scheduled by the SCI; or thefeedback indication field comprises a feedback bit representing thefeedback information; or the feedback indication field comprises a valuein a predefined set, and the value represents that the feedbackinformation is carried in or reused by the PSSCH scheduled by the SCI.5. The sidelink transmission method according to claim 4, wherein in thecase that a quantity of the feedback bits of the feedback information issmaller than a specific threshold, the feedback indication fieldcomprises the feedback bits; in the case that the quantity of thefeedback bits of the feedback information is greater than or equal tothe specific threshold, the feedback indication field comprises thevalue in the predefined set.
 6. The sidelink transmission methodaccording to claim 2, wherein the feedback information comprises atleast one of: retransmission acknowledgment information and a ChannelState Information (CSI) measurement result.
 7. The sidelink transmissionmethod according to claim 4, wherein an encoding and mapping mode of thefeedback information in the PSSCH corresponds to the value; and/or thequantity of the feedback bits of the feedback information in the PSSCHcorresponds to the value.
 8. The sidelink transmission method accordingto claim 3, wherein in the case that the feedback information is carriedin or reused by the PSSCH scheduled by the SCI, the beta-offsetindication field is used to indicate a beta-offset configuration usedfor bit mapping of the PSSCH; or the beta-offset indication fieldcomprises a predefined value or a predefined code point, and thepredefined value or the predefined code point represents that thefeedback information is not carried in the SCI or the PSSCH scheduled bythe SCI; or in the case that a value comprised in the beta-offsetindication field belongs to a first predefined sub-space, thebeta-offset indication field is used to indicate that the feedbackindication field comprises a feedback bit and indicate the beta-offsetconfiguration used for the bit mapping of the PSSCH; or in the case thatthe value of the beta-offset indication field belongs to a secondpredefined sub-space, the beta-offset indication field is used toindicate a specific feedback mode.
 9. The sidelink transmission methodaccording to claim 8, wherein the specific feedback mode comprises: amode that the feedback indication field comprises the predefined valueor the predefined code point; or a mode that the feedback indicationfield comprises feedback information of a specific type; or a mode thatwhether only the feedback bits, rather than high-layer data or aTransport Block (TB), are carried in the PSSCH scheduled by the SCI. 10.The sidelink transmission method according to claim 3, wherein thescheduling data indication field is used to indicate whether only thefeedback bits, rather than high-layer data or a TB, are carried in thePSSCH scheduled by the SCI, the scheduling data indication field is afield independent of another field in the SCI, or the scheduling dataindication field is at least one value or code point in the other field,wherein the other field is a PSSCH time-domain or frequency-domainresource allocation field, the feedback indication field, thebeta-offset indication field, the acknowledge request indication field,the measurement configuration indication field, the reference signalindication field, the feedback object indication field information, orthe HARQ process number field; or the acknowledgement request indicationfield is used to indicate whether to transmit acknowledgement feedbackby a receiving terminal with respect to the PSSCH scheduled by the SCI,and the receiving terminal is a terminal which receives the PSSCH; orthe measurement configuration indication field is used to indicatewhether to enable sidelink channel measurement and indicate ameasurement configuration for the sidelink channel measurement; or thereference signal indication field is used to indicate whether to enablesidelink reference signal measurement, and indicate a reference signalconfiguration of the sidelink measurement reference signal, wherein whenthe sidelink reference signal measurement is enabled, a resource mappingposition of the PSSCH scheduled by the SCI does not overlap with aresource position of the reference signal; or the feedback objectindication field is used to indicate an Identity (ID) of a receivingterminal, a group ID of the receiving terminal, a fixed ID of thereceiving terminal allocated by a network, a temporary ID or and atruncated ID of the receiving terminal allocated by the network, and thereceiving terminal is a terminal that performs feedback; or the HARQprocess number field is used to indicate at least one of an HARQ processfor the SCI-scheduling data and an HARQ process for HARQ-Acknowledgement(ACK) feedback.
 11. A terminal, which is a second terminal and comprisesa memory, a processor, and a computer program stored in the memory andcapable of being executed by the processor, wherein the processor isconfigured to execute the computer program to implement steps of thesidelink transmission method comprising: receiving SCI through a PSCCHof a sidelink, wherein the SCI comprises an information field, and theinformation field is used to indicate physical layer information of thesidelink.
 12. The terminal according to claim 11, wherein the physicallayer information comprises at least one of: feedback information, abeta-offset indicator, a scheduling data indicator, an acknowledgementrequest indicator, a measurement configuration, a reference signalindicator, a feedback object indicator and an HARQ process indicator.13. The terminal according to claim 11, wherein the information fieldcomprises at least one of: a feedback indication field, a beta-offsetindication field, a scheduling data indication field, an acknowledgementrequest indication field, a measurement configuration indication field,a reference signal indication field, a feedback object indication fieldand an HARQ process number field.
 14. The terminal according to claim13, wherein the feedback indication field comprises a predefined valueor a predefined code point, and the predefined value or the predefinedcode point represents that the feedback information is not carried inthe SCI or the PSSCH scheduled by the SCI; or the feedback indicationfield comprises a feedback bit representing the feedback information; orthe feedback indication field comprises a value in a predefined set, andthe value represents that the feedback information is carried in orreused by the PSSCH scheduled by the SCI.
 15. The terminal according toclaim 14, wherein in the case that a quantity of the feedback bits ofthe feedback information is smaller than a specific threshold, thefeedback indication field comprises the feedback bits; in the case thatthe quantity of the feedback bits of the feedback information is greaterthan or equal to the specific threshold, the feedback indication fieldcomprises the value in the predefined set.
 16. The terminal according toclaim 12, wherein the feedback information comprises at least one of:retransmission acknowledgment information and a CSI measurement result.17. The terminal according to claim 14, wherein an encoding and mappingmode of the feedback information in the PSSCH corresponds to the value;and/or the quantity of the feedback bits of the feedback information inthe PSSCH corresponds to the value.
 18. The terminal according to claim13, wherein in the case that the feedback information is carried in orreused by the PSSCH scheduled by the SCI, the beta-offset indicationfield is used to indicate a beta-offset configuration used for bitmapping of the PSSCH; or the beta-offset indication field comprises apredefined value or a predefined code point, and the predefined value orthe predefined code point represents that the feedback information isnot carried in the SCI or the PSSCH scheduled by the SCI; or in the casethat a value comprised in the beta-offset indication field belongs to afirst predefined sub-space, the beta-offset indication field is used toindicate that the feedback indication field comprises a feedback bit andindicate the beta-offset configuration used for the bit mapping of thePSSCH; or in the case that the value of the beta-offset indication fieldbelongs to a second predefined sub-space, the beta-offset indicationfield is used to indicate a specific feedback mode.
 19. The terminalaccording to claim 13, wherein the scheduling data indication field isused to indicate whether only the feedback bits, rather than high-layerdata or a TB, are carried in the PSSCH scheduled by the SCI, thescheduling data indication field is a field independent of another fieldin the SCI, or the scheduling data indication field is at least onevalue or code point in the other field, wherein the other field is aPSSCH time-domain or frequency-domain resource allocation field, thefeedback indication field, the beta-offset indication field, theacknowledge request indication field, the measurement configurationindication field, the reference signal indication field, the feedbackobject indication field information, or the HARQ process number field;or the acknowledgement request indication field is used to indicatewhether to transmit acknowledgement feedback by a receiving terminalwith respect to the PSSCH scheduled by the SCI, and the receivingterminal is a terminal which receives the PSSCH; or the measurementconfiguration indication field is used to indicate whether to enablesidelink channel measurement and indicate a measurement configurationfor the sidelink channel measurement; or the reference signal indicationfield is used to indicate whether to enable sidelink reference signalmeasurement, and indicate a reference signal configuration of thesidelink measurement reference signal, wherein when the sidelinkreference signal measurement is enabled, a resource mapping position ofthe PSSCH scheduled by the SCI does not overlap with a resource positionof the reference signal; or the feedback object indication field is usedto indicate an ID of a receiving terminal, a group ID of the receivingterminal, a fixed ID of the receiving terminal allocated by a network, atemporary ID or and a truncated ID of the receiving terminal allocatedby the network, and the receiving terminal is a terminal that performsfeedback; or the HARQ process number field is used to indicate at leastone of an HARQ process for the SCI-scheduling data and an HARQ processfor HARQ-ACK feedback.
 20. A computer-readable storage medium storingtherein a computer program, wherein the computer program is capable ofbeing executed by a processor to implement steps of a sidelinktransmission method comprising: receiving SCI through a PSCCH of asidelink, wherein the SCI comprises an information field, and theinformation field is used to indicate physical layer information of thesidelink.